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FreeBSD-EN-15:10.iconv                                          Errata Notice
                                                          The FreeBSD Project

Topic:          Improved iconv(3) UTF-7 support

Category:       core
Module:         libc/iconv
Announced:      2015-06-30
Credits:        Tijl Coosemans
Affects:        FreeBSD 10.x
Corrected:      2015-06-02 09:42:00 UTC (stable/10, 10.1-STABLE)
                2015-06-30 23:21:37 UTC (releng/10.1, 10.1-RELEASE-p14)

For general information regarding FreeBSD Errata Notices and Security
Advisories, including descriptions of the fields above, security
branches, and the following sections, please visit
<URL:https://security.freebsd.org/>.

I.   Background

The iconv(3) API allows converting text data from one character set
encoding to another.  Applications first open a converter between two
encodings using iconv_open(3) and then convert text using iconv(3).

UTF-7 is a variable-length character encoding representing Unicode text
using a stream of ASCII characters.

II.  Problem Description

A defect in the iconv(3) UTF-7 decoding process causes the end of base64
symbols ("-") to be treated as an incomplete character when they exist
at the end of the string.

III. Impact

Applications that use iconv(3) to decode UTF-7 may receive an incorrect
encoded result.

IV.  Workaround

No workaround is available.

V.   Solution

Perform one of the following:

1) Upgrade your system to a supported FreeBSD stable or release / security
branch (releng) dated after the correction date.

2) To update your present system via a binary patch:

Systems running a RELEASE version of FreeBSD on the i386 or amd64
platforms can be updated via the freebsd-update(8) utility:

# freebsd-update fetch
# freebsd-update install

3) To update your present system via a source code patch:

The following patches have been verified to apply to the applicable
FreeBSD release branches.

a) Download the relevant patch from the location below, and verify the
detached PGP signature using your PGP utility.

# fetch https://security.FreeBSD.org/patches/EN-15:10/iconv.patch
# fetch https://security.FreeBSD.org/patches/EN-15:10/iconv.patch.asc
# gpg --verify iconv.patch.asc

b) Apply the patch.  Execute the following commands as root:

# cd /usr/src
# patch < /path/to/patch

c) Recompile the operating system using buildworld and installworld as
described in <URL:https://www.FreeBSD.org/handbook/makeworld.html>.

Restart all deamons using the library, or reboot the system.

VI.  Correction details

The following list contains the correction revision numbers for each
affected branch.

Branch/path                                                      Revision
- -------------------------------------------------------------------------
stable/10/                                                        r283908
releng/10.1/                                                      r284985
- -------------------------------------------------------------------------

To see which files were modified by a particular revision, run the
following command, replacing NNNNNN with the revision number, on a
machine with Subversion installed:

# svn diff -cNNNNNN --summarize svn://svn.freebsd.org/base

Or visit the following URL, replacing NNNNNN with the revision number:

<URL:https://svnweb.freebsd.org/base?view=revision&revision=NNNNNN>

VII. References

<URL:https://bugs.freebsd.org/200398>

The latest revision of this Errata Notice is available at
https://security.FreeBSD.org/advisories/FreeBSD-EN-15:10.iconv.asc

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